A zero coupon bond with a 6 percent YTM has 20 years to maturity. Two years later,

Question:

A zero bond with a 6 percent YTM has 20 years to maturity. Two years later, the price of the bond remains the same. What's going on here?
Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...